Question

In ΔABC if A = 60° , b = 3 and c = 8 then find a. *
A) 8
B) 9
C) 7
D) 6​

Answer 1

Answer:

Correct option is

A

c

2

−3c−7=0

a=4,b=3,∠A=60

0

Using cosine rule,

cosA=

2bc

b

2

+c

2

−a

2

we have

⇒

2

1

=

6c

9+c

2

−16

⇒3c=9+c

2

−16

⇒c

2

−3c−7=0

Step-by-step explanation:

hope it's helpful for you

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Answer 2

Given :  In ΔABC if A = 60° , b = 3 and c = 8

To Find :  a

A) 8

B) 9

C) 7

D) 6​

Solution:

Using cosine rule of triangle

a²  = b²  + c²  - 2bc cosA

=> a ²  = 3²  + 8² - 2(3)(8)cos60°

=> a²  = 9 + 64 - 48 (1/2)

=> a²  = 9 + 64 - 24

=> a² = 49

=> a = 7

Hence Value of a is 7

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